ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Polymer and Materials Science  (57)
  • COMMUNICATIONS AND RADAR  (5)
  • Serotonin  (3)
  • 1990-1994  (30)
  • 1980-1984  (35)
  • 1920-1924
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Phylogenetic study of serotonin-immunoreactive structures in the pancreas of various vertebrates (1991)
    Springer
    Cell & tissue research 263 (1991), S. 237-243 
    Details
    ISSN: 1432-0878
    Keywords: Serotonin ; Pancreas ; Phylogenic study ; Immunohistochemistry ; Teleosts ; Chicken ; Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The distribution pattern of serotonin (5HT) in the pancreas was studied immunohistochemically by using a 5HT monoclonal antibody in various vertebrates including the eel, bullfrog, South African clawed toad, turtle, chicken, mouse, rat, guinea-pig, cat, dog and human. In all species examined, except the bullfrog, 5HT-like immunoreactivity was observed in nerve fibers, in endocrine cells, or in both. Positive nerve fibers were found in the eel, turtle, mouse, rat and guinea-pig. These fibers ran mainly along the blood vessels and partly through the gap between the exocrine glands. In the eel and guinea-pig, positive fibers invaded the pancreatic islet. Occasionally, these positive fibers were found adjacent to the surface of both exocrine and endocrine cells, suggesting a regulatory role of 5HT in pancreatic function. 5HT-positive endocrine cells were observed in the pancreas of all species except for the bullfrog and rat. In the eel and in mammals such as the mouse, guinea-pig, cat, dog and human, 5HT-positive cells were mainly observed within the pancreatic islet. In the South African clawed toad, turtle and chicken, the positive cells were mainly in the exocrine region. The present study indicates that the distribution patterns of 5HT in the pancreas varies considerably among different species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318765
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Transplantation of the rat pineal organ to the brain: pinealocyte differentiation and innervation (1990)
    Springer
    Cell & tissue research 260 (1990), S. 273-278 
    Details
    ISSN: 1432-0878
    Keywords: Pineal organ ; Transplantation ; Serotonin ; Tyrosine hydroxylase ; Rat (Wistar)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The pineal organ of neonatal rats was transplanted to the frontal part of the cerebral cortex or the cerebral interhemispheric fissure of an isogenic adult rat to determine whether pineal differentiation and pinealopetal innervation are affected by aberrant neuronal influences. Transplants were fixed for immunohistochemistry at 1, 2 and 6 months after transplantation. When treated with an anti-serotonin antibody, cells in transplants from both locations showed intense immunoreactivity and a morphology comparable to intact pinealocytes, indicating that the transplanted pinealocytes had differentiated normally. Tyrosine hydroxylase immunohistochemistry revealed that new catecholamine fibers of central nervous origin extended only into the periphery and not into the core of transplants grafted within the cortex. However, numerous catecholamine fibers were found in transplants placed in the interhemispheric fissure. These fibers were often accompanied by blood vessels, suggesting that they derived from sympathetic ganglia. Serotonin fibers, which are densely distributed in the cerebral cortex, were seldom found to enter transplants from both locations. These observations indicate that pineal cells express their characteristic properties even when transferred to a foreign milieu and that they do not receive novel innervation from the central nerves that normally do not innervate the intact pineal body; the transplant thereby retains the property of selective pinealopetal innervation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318630
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Antistatic modification of polyester with carboxyterminated poly(oxyethylene) (1994)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 217 (1994), S. 129-137 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Carboxy-terminierte Polyoxyethylene (PEO-acid) mit zahlenmittleren Molekulargewichten Mn = 8400, 3300 und 1000 wurden zur antielektrostatischen Modifizierung von Polyethylenterephthalat (PET) verwendet. Fasern aus PET-PEO-acid-Blends mit 2,0 oder 5,0 Gew.-% PEO-acid wurden bei 285°C mit einem normalen Extruder aus der Schmelze gesponnen und anschließend bei 80°C um das ca. 4,5fache verstreckt. Die Verarbeitbarkeit beim Verspinnen und Verstrecken war bei Verwendung von PEO-acid mit hohen Molekulargewichten ausgezeichnet. Die anti-elektrostatischen Eigenschaften wurden ebenfalls mit steigendem PEO-acid-Molekulargewicht besser. Da eine Umesterung beim Verspinnen nur in geringem Ausmaß stattfand, blieben die mechanischen Eigenschaften der Blend-Fasern gegenüber den PET-Fasern nahezu unverändert.
    Notes: Carboxy-terminated poly(oxyethylenes) (PEO-acid) with number-average molecular weights Mn = 8400, 3300, and 1000 were used for antielectrostatic modification of poly(ethylene terephthalate) (PET). The blend PET fibers containing 2.0 and 5.0 wt.-% of PEO-acids were melt-spun at 285°C with an ordinary extruder and then drawn about 4.5-fold at 80°C. The processabilities of spinning and drawing were excellent at higher molecular weights of PEO-acid. The anti-electrostatic properties of the blend fibers became also improved with increasing molecular weight of PEO-acid. Since little ester interchange reaction took place between PET and PEO-acid during meltspinning, the blend fibers could retain almost the same mechanical properties as the original PET fiber.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1994.052170113
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Strategy for the synthesis of large peptides: An application to the total synthesis of human parathyroid hormone [hPTH(1-84)] (1981)
    New York : Wiley-Blackwell
    Biopolymers 20 (1981), S. 1823-1832 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A strategy suitable for the synthesis of larger peptides is proposed. It involves the following four considerations: (1) all of the side-chain functional groups are protected by benzyl-type protective groups; (2) a water-soluble carbodiimide, 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide, is used for the fragment-condensation reactions together with 1-hydroxybenzotriazole as the additive; (3) all the protective groups are cleaved simultaneously by the HF method in the final stage of the synthesis; and (4) side products formed are detected and removed by an efficient high-performance liquid chromatography procedure. The usefulness of these procedures is demonstrated taking the synthesis of human parathyroid hormone [hPTH(1-84)] as an example.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1981.360200907
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Synthesis and conformation of the cyclic octapeptides cyclo(Phe-Pro)4, cyclo(Leu-Pro)4, and cyclo[Lys(Z)-Pro]4 (1983)
    New York : Wiley-Blackwell
    Biopolymers 22 (1983), S. 2191-2206 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cyclic octapeptides, cyclo(X-Pro)4, where X represents Phe, Leu, or Lys(Z), were synthesized and their conformations investigated. A C2-symmetric conformer containing two cis peptide bonds was found in all of these cyclic octapeptides. The numbers of available conformations due to the cis-trans isomerization of Pro peptide bonds depended on the nature of the solvent and X residue: they decreased in the following order: cyclo[Lys(Z)-Pro]4 〉 cyclo(Leu-Pro)4 〉 cyclo(Phe-Pro)4 in CDCl3. 13C spin-lattice relaxation times (T1) of these cyclic octapeptides were measured, and the contribution of segmental mobility to T1 was found to vary with the nature of the X residue.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360221006
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Computer building of β-helical polypeptide models (1984)
    New York : Wiley-Blackwell
    Biopolymers 23 (1984), S. 23-38 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A general method is presented for computing the atomic coordinates of helices in which a dipeptide is the repeating unit. The method will generate both single- and double-stranded model helices having idealized bond lengths and angles, and any arbitrary, user-specified, pitch and number of residues per turn. The variation of inter- and intrastrand hydrogen bonds with pitch and number of residues per turn can thus be examined. An application of the method is the construction of a β-helix having pitch of 6.3 Å per turn and 4.85 residues per turn, a model which can pack nicely into the unit cell of crystals of cation-bound gramicidin A.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360230104
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    The cystine-stabilized α-helix: A common structural motif of ion-channel blocking neurotoxic peptides (1991)
    New York : Wiley-Blackwell
    Biopolymers 31 (1991), S. 1213-1220 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Neurotoxic peptides from venoms of scorpions and honey bees exhibit a consensus pattern in the two disulfide bridgings related to the sequence portions Cys-X-Cys and Cys-X-X-X-Cys. A revised three-dimensional structure of charybdotoxin, as determined by two-dimensional nmr spectroscopy, confirms that the consensus cystine dislocation generates in all these toxins a common structural element, i.e., the cystine-stabilized α-helical (CSH) motif, which may be correlated with their common ion channel blocking activity.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360311009
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    A peculiar temperature-dependent behavior of iodine species at the formation of chromophore between iodine and aqueous poly(vinyl alcohol) (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 749-755 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The blue colored complex between poly(vinyl alcohol) (PVA) and iodine was prepared at 5°C by mixing an aqueous solution of PVA with an aqueous ethanolic solution of iodine containing boric acid. The absorption spectrum of the system shows bands at 226 nm (A), 290 nm (B), 355 nm (C), and 650 nm (D). Their relative absorbances change largely depending on temperature. When the system is gradually warmed, the chromophoric band D decays and the intensity of band A increases. By lowering the temperature again to 5°C the concentration of chromophore increases. It was found that the decay and the re-formation of the chromophore are reversible in the temperature range 5 to 15°C. Above 15°C, contrarily, hysteresis effects are encountered for the re-formation. Thus, when the chromophore is re-formed at 5°C, the spectra shows an isosbestic point at 420 nm, between bands C and D. The dependence on temperature of bands B and C is quite independent from each other, which strongly indicates that the latter band should be assigned to another iodide species than the I-3 ion (band B) and the I- ion (band A). Based on these experimental data a new mechanism is proposed involving the complex ion I-3 · I2 which is supposed to be a precursor of the chromophoric pentaiodide ion I5-.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.021850411
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Iodine-poly(vinyl alcohol) interactions, 5Part 4: cf. ref. 1. Releasing mechanism of I- and I2 in the decomposition process of the blue complex (1993)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 194 (1993), S. 295-303 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: By treating a blue-colored solution of poly(vinyl alcohol) (PVA), iodine and boric acid with an anion exchange resin, a solution consisting only of the polyiodide ion bound to the PVA matrix was obtained. In order to re-establish the equilibrium between polyidodide, I2 and I-, the bound polyiodide ions decomposed to I- and I2. When this happend at temperatures below 10°C, only I- was released from the PVA matrix with I2 remaining in it, and a new equilibrium state was reestablished. However, above 20°C all polyiodide ions were decomposed without recovering the equilibrium of the reaction. In this case both I2 and I- were released from the PVA matrix. Based on these findings a new mechanism for the formation and decomposition of polyiodide ions was deduced. From the initial and equilibrium concentrations of the polyiodide ions at 5 and 10°C, approximate dissociation constants to I- (free) and I2 (bound) were estimated.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1993.021940126
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Cation-binding ability of tactic poly(crown ether)s (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 1579-1586 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Cation-binding ability of tactic poly(crown ether)s was evaluated by solvent extraction of alkali metal picrates. It was found that isotactic poly(crown ether)s bind particular cations, which can be easily sandwiched by two neighboring crown ether units, a little more effectively than syndiotactic ones. No difference of cation-binding ability was, however, observed between the corresponding d,l- and meso-bis(crown ether)s. This suggests that the rigidity of the poly(crown ether)s, in combination with the tactic configurations, causes the difference in the cation-binding ability.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820528
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...